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System for converting at least one electrical input direct current into an electrical polyphase output alternating current

a technology of electrical polyphase and alternating current, which is applied in the direction of dc-ac conversion without reversal, process and machine control, instruments, etc., can solve the problems of relatively large line voltage drop in conversion systems of this type, and the conversion system of this type is not modular, so as to reduce the generated line voltage drop and the effect of adding an inverter

Active Publication Date: 2010-07-01
CONVERTEAM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a modular conversion system that allows for easy addition of inverters in parallel, while reducing common mode inductance between the phases of the output current to reduce voltage drops. The system includes N electromagnetic coupling coils, each connected to a different phase of the output current. The coils are wound in opposite directions around a core, and the fluxes they generate cancel each other out, reducing the common mode inductance. The system also includes a single bus for circulating the input direct current, which helps to reduce the homopolar current. Overall, the system makes it easier to add more inverters and reduces the impact of voltage drops on the output current."

Problems solved by technology

However, conversion systems of this type are not modular, since adding an inverter, in parallel with the other inverters which are already present, makes it necessary to add a magnetic core equipped with a coupling coil in each magnetic coupler.
Also, conversion systems of this type generate relatively large line voltage drops.

Method used

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  • System for converting at least one electrical input direct current into an electrical polyphase output alternating current
  • System for converting at least one electrical input direct current into an electrical polyphase output alternating current
  • System for converting at least one electrical input direct current into an electrical polyphase output alternating current

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Embodiment Construction

[0051]It should be remembered that, in the rest of the description, two points marked by the same letter in a figure are, by convention, connected to each other by an electrical link, which is not shown to make the diagram easier to read.

[0052]Referring to FIG. 2, it can be seen that the conversion system of the invention comprises, firstly, the same components as those of FIG. 1, i.e. three three-phase inverters 2A, 2B, 2C arranged in parallel with each other, and three magnetic couplers 6A, 6B, 6C each including three first electromagnetic coupling coils 8. Each first electromagnetic coupling coil 8 is wound around a respective core 10, the cores 10 of a single magnetic coupler 6A, 6B, 6C being connected to each other by magnetic linking bars 12.

[0053]In the embodiment of FIG. 2, the cores 10 and magnetic linking bars 12 of a same magnetic coupler 6A, 6B, 6C are approximately coplanar. The cores 10 are approximately parallel to each other, and the magnetic linking bars 12 are appr...

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Abstract

A system for converting at least one electrical input direct current into an electrical output alternating current comprising M phases and supplied to M output terminals includes N polyphase inverters, connected in parallel, each converting the input direct current into an intermediate alternating current comprising M phases and supplied to M intermediate terminals; N×M first electromagnetic coupling coils, each being connected to a respective intermediate terminal; N×M magnetic cores, each first coil being wound around a respective core.This system comprises N×M second electromagnetic coupling coils, each being connected to a respective first coil and wound around a distinct core from that of the respective first coil. The first and second coils of a same core correspond to a single phase, and generate respective common mode fluxes of opposite directions. Each output terminal is connected to the M second coils of a single phase.

Description

[0001]This claims the benefit of French Patent Application No. 08 59062, filed on Dec. 24, 2008 and hereby incorporated by reference herein.[0002]The present invention relates to a system for converting at least one electrical input direct current into an electrical output alternating current comprising a plurality M of phases and supplied to M output terminals, each output terminal corresponding to one phase of the output current.[0003]The invention also relates to a module for converting an electrical input direct current which is supplied at two input terminals into an electrical output alternating current comprising a plurality M of phases and supplied to M output terminals, each output terminal corresponding to one phase of the output current.[0004]The invention also relates to a conversion system, which is equipped with multiple conversion modules connected in parallel with each other.[0005]The invention also relates to electrical power equipment which is equipped with at leas...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02M7/42
CPCH02M7/493
Inventor COSTAN, VALETINGOLLENTZ, BERNARD
Owner CONVERTEAM TECH LTD
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